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WINDOW -JAO K 110,491,146. Y Patented Feb. 7,189 3;-

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U ITED STATES PATENT OFFICE.

DOUGLASA. THURSTON, OF TORONTO, CANADA.

WINDOW-JACK.-

SPEGIFIGATION forming part of Letters Iatent No. 491,146, dated February'7, 1893.

Application filed January 2, 1892. Serial No. 416,762- (No model.)

To all whom it may concern.-

Be it knownthat I, DOUGLAS A. THURSTON, a subject of the Queen of GreatBritain, residing at Toronto, county of York, Province of Ontario,Canada, have invented a certain new and useful Improvement in Window-Jacks; and I declare the following to be a full, clear, and exactdescription of the same, such as will enable others skilled in the artto which it pertains to make and use the same, reference being had tothe accompanying drawings, which form a part of this specification.

My invention relates to window jacks, for use in painting and cleaningwindows, and its object is to provideastructu re adapted to rest on andbe clutched to the window frame, and to furnish a secure seat for theperson washing or painting the windows, with a back portion adapted tosupportthe body and prevent accident. In such a structure, it isnecessary to provide for a great variety of windows, having differentwidths, and made according to different designs. To accomplish thisresult, I provide my window jack with several adjustrnents, adapting itto meet the requirements of a large range of difference in windows.

In the drawings, Figure 1 is a perspective 0 of the device from theunder side, showing the details of construction, and the frame and backportion folded together. Fig. 2 is a front elevation of the device,attached to a window, showing the back, and the window partially raised.Fig. 3 is a vertical section through a window, showing a side elevationof the device. Fig. 4 is a view showing the device attached to a windowhaving a single wooden sill.

In the drawings, A is the frame, A, the 40 back pivoted to the frame.The back is supported, when raised into its vertical position, by tierods, consisting of the links a, a, adapted to fold upon themselves,when, the back is folded onto the frame. The frame is provided with aseat, (1', extending back a sufficient distance so that the body of theperson using the device comes outside of the window a sufficientdistance to enable him to use both hands in his work. Into the sides ofthe frame, and having a sliding connection therewith, are the shelves aeach having an openmg in which to support a water pail or other vessel,as shown in Fig. 2. When the device is folded, these shelves may beshoved into the frame and out of the way.

B is a support, rigidly attached to the frame, from which the movableparts constituting the remaining supports for the frame are operated.This support B is adapted to rest on the window-stool b.

O, O, are sliding supports provided at the outer and lower end with thehook c, for engaging the inner edge of the window stool I). Thesesupports O, O, are adjusted longitudinally of the frame through theracks c, operated by the pinion 0 mounted on the transverse shaft c Onthe center of this shaft is mounted the pinion c, engaging with the wormc on the shaft 0. This shaft is mounted in the frame, and extendsforward through the support B, and is provided with a square end 0 foroperating it with a key.

Back of the shaft 0 is the sliding support D. This support has a slidingconnection at d, with the ways a on the frame. The screw shaft D has ascrew connection at (1 with the sliding support D, and is provided ateach side of the support B with a collar 01 which holds it in a fixedposition longitudinally with the support B, and adapts it, when rotatedby means of a key, by reason of its screw connection with the support D,to adjust that support on the sliding way, a, of the frame. By means ofthis adjustment, the support D may be forced back to the rear end of theframe, if necessary, and adapted to any width of window. This supportDis provided with supporting blocks (1 having a vertical adjustment onthe support D, consisting of a sliding connection with the support, incombination with a set screw d on the back of the support, for holdingthem in any position of adjustment. These blocks 01 are provided to restupon the window sill E, as shown in Fig. 3,.and the portion d of'thesupport D extending below these blocks d rests against the outer side ofthe window sill. By reference to Fig. 3, it may be seen that by thisconstruction, the window frame is embraced between the support D restingagainst the out side of the window sill and the hooks 0 engaged with theinside of the Window stool;

while the frame and seat of the device is supported on the stationarysupport B and the adjustable supports (1 In engaging the device with thewindow, it is designed to rest the support B on the window stool justinside of the window stop 6. While the supports D and O, with the hooko, are forced to embrace and clutch the window by operating with a keythe screw shafts O and D. The shaft 0, drawing the hook c inward throughthe rack and. pinion connection, and the shaft D drawing the support Dby reason of its screw connection therewith By operating these twoadjustments, the window jack may be clutched to a window frame of anywidth within areasonable limit.

In Fig. 4 is shown a common form of window frame, in which the windowstool and the window sill are formed of one piece, F, usually of wood,having the outer or sill portion, f, beveled to form an incline. Toadapt the jack to rest on a Window frame of this description, thesupports d are provided with an additional support 01 pivoted to the endof the support at, and normally swung up above them; but adapted to beswung below, and provided with an angular block underneath the supportto make it conform to the bevel of the window sill. The hooks c arepreferably pivoted to the ends of the supports 0.

In cases where the Window frame is narrow, and the support D isnecessarily drawn well in under the frame, I provide a strut Gsupporting the outer end of the frame from the lower end of the supportD. This strut I pivot to a sliding block G, mounted in the frame, andmoved lengthwise of the frame by means of the screw g. The strut G isadapted normally to swing against the frame, as is shown in Fig. 1, outof the way. When it is desired to engage it with the support D, theframe is first clutched to the window, after which the sliding block Gmay be moved forward by the screw g, until the strut, when opened, willabut against the lug g on the support D. On the bottom of the frame isthe lug a into which the free end of the strut may be forced to hold itin its closed position on the frame when not in use.

What I claim is 1. In a window jack, the combination of a frame, thestationary supports B, the sliding supports 0, 0, provided with thehooks a, screw shaft, worm gear, and rack and pinion for operating saidsupports 0, C, and the sliding support D with the screw shaft foroperating it, substantially as described.

2. In a window jack, the combination of a frame, stationary supports,sliding supports provided with hooks adapted to engage inside of thewindow seat, means for operating said sliding supports and holding thesame in position in engagement with the window, and a movable supportwith means for operating and holdingit in position, substantially asdescribed.

3. The combination of a frame, stationary supports, sliding supportsprovided with hooks for engagement with the window seat, a rack andpinion for operating said supports, and means for operating said rackand pinion and holding them in position, and amovable support D withmeans for operating it and holding it in position, substantially asdescribed.

In testimony whereof I sign this specification in the presence of twowitnesses.

DOUGLAS A. THURSTON.

Witnesses:

RIoHD. OREDICOTT, IV. J. FRANKS.

